truncate

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Version: 21 ÄÅËÁÂÒÑ 1998 (openSuse - 09/10/07)

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Section: 2 (Appels système)

îáú÷áîéå

truncate, ftruncate - ÏÂÒÅÚÁÔØ ÆÁÊÌ ÄÏ ÕËÁÚÁÎÎÏÊ ÄÌÉÎÙ

ëòáôëáñ ó÷ïäëá

#include <unistd.h>

int truncate(const char *path, off_t length);
int ftruncate(int fd, off_t length);

ïðéóáîéå

truncate ÏÂÒÅÚÁÅÔ ÆÁÊÌ Ó ÉÍÅÎÅÍ path ÉÌÉ ÏÂÏÚÎÁÞÅÎÎÙÊ ÆÁÊÌÏ×ÙÍ ÄÅÓËÒÉÐÔÏÒÏÍ fd ÄÏ length ÂÁÊÔ. åÓÌÉ ÆÁÊÌ ÄÏ ÜÔÏÊ ÏÐÅÒÁÃÉÉ ÂÙÌ ÄÌÉÎÎÅÅ, ÔÏ ÏÓÔÁ×ÛÉÅÓÑ ÄÁÎÎÙÅ ÔÅÒÑÀÔÓÑ. åÓÌÉ ÆÁÊÌ ÂÙÌ ËÏÒÏÞÅ, ÔÏ ÎÅ ÏÐÒÅÄÅÌÅÎÏ, ÏÓÔÁÎÅÔÓÑ ÌÉ ÄÌÉÎÁ ÆÁÊÌÁ ÎÅÉÚÍÅÎÎÏÊ ÉÌÉ ÖÅ ÏÎÁ Õ×ÅÌÉÞÉÔÓÑ. ÷ ÐÏÓÌÅÄÎÅÍ ÓÌÕÞÁÅ ÎÏ×ÙÊ ËÕÓÏË ÆÁÊÌÁ ÂÕÄÅÔ ÓÏÄÅÒÖÁÔØ ÎÕÌÅ×ÙÅ ÂÁÊÔÙ. ðÒÉ ÉÓÐÏÌØÚÏ×ÁÎÉÉ ftruncate ÆÁÊÌ ÄÏÌÖÅÎ ÂÙÔØ ÏÔËÒÙÔ ÄÌÑ ÚÁÐÉÓÉ.

÷ïú÷òáýáåíïå úîáþåîéå

÷ ÓÌÕÞÁÅ ÕÓÐÅÈÁ ×ÏÚ×ÒÁÝÁÅÔÓÑ ÎÏÌØ. ðÒÉ ÏÛÉÂËÅ ×ÏÚ×ÒÁÝÁÅÔÓÑ -1, Á errno ÕÓÔÁÎÁ×ÌÉ×ÁÅÔÓÑ ÄÏÌÖÎÙÍ ÏÂÒÁÚÏÍ.

ïûéâëé

äÌÑ truncate:

ENOTDIR

ëÏÍÐÏÎÅÎÔ ÐÕÔÉ, ÉÓÐÏÌØÚÏ×ÁÎÎÙÊ ËÁË ËÁÔÁÌÏÇ, × ÄÅÊÓÔ×ÉÔÅÌØÎÏÓÔÉ ÔÁËÏ×ÙÍ ÎÅ Ñ×ÌÑÅÔÓÑ.

ENAMETOOLONG
ëÏÍÐÏÎÅÎÔ ÐÕÔÉ ÐÒÅ×ÙÛÁÅÔ 255 ÓÉÍ×ÏÌÏ× ÉÌÉ ×ÅÓØ ÐÕÔØ ÐÒÅ×ÙÛÁÅÔ 1023 ÓÉÍ×ÏÌÁ.
ENOENT
æÁÊÌ ÎÅ ÓÕÝÅÓÔ×ÕÅÔ.
EACCES
÷ ÏÄÎÏÍ ÉÚ ËÏÍÐÏÎÅÎÔÏ× ÐÕÔÉ ÎÅ ÒÁÚÒÅÛÅÎ ÐÏÉÓË.
EACCES
ðÏÌØÚÏ×ÁÔÅÌØ ÎÅ ÉÍÅÅÔ ÐÒÁ× ÎÁ ÚÁÐÉÓØ × ÕËÁÚÁÎÎÙÊ ÆÁÊÌ.
ELOOP
ðÒÉ ÐÒÏÈÏÖÄÅÎÉÉ ÐÕÔÉ ×ÓÔÒÅÞÅÎÏ ÓÌÉÛËÏÍ ÍÎÏÇÏ ÓÉÍ×ÏÌÉÞÅÓËÉÈ ÓÓÙÌÏË.
EISDIR
õËÁÚÁÎÎÙÊ ÆÁÊÌ Ñ×ÌÑÅÔÓÑ ËÁÔÁÌÏÇÏÍ.
EROFS
æÁÊÌ ÎÁÈÏÄÉÔÓÑ ÎÁ ÆÁÊÌÏ×ÏÊ ÓÉÓÔÅÍÅ, ÓÍÏÎÔÉÒÏ×ÁÎÎÏÊ ÔÏÌØËÏ ÄÌÑ ÞÔÅÎÉÑ.
ETXTBSY
æÁÊÌ Ñ×ÌÑÅÔÓÑ ÉÓÐÏÌÎÑÅÍÙÍ É × ÎÁÓÔÏÑÝÉÊ ÍÏÍÅÎÔ ×ÙÐÏÌÎÑÅÔÓÑ.
EIO
ðÒÉ ÏÂÎÏ×ÌÅÎÉÉ inode ÐÒÏÉÚÏÛÌÁ ÏÛÉÂËÁ ××ÏÄÁ-×Ù×ÏÄÁ.
EFAULT
path ÕËÁÚÙ×ÁÅÔ ÚÁ ÐÒÅÄÅÌÙ ÄÏÓÔÕÐÎÏÇÏ ÁÄÒÅÓÎÏÇÏ ÐÒÏÓÔÒÁÎÓÔ×Á.

äÌÑ ftruncate:

EBADF
îÅ×ÅÒÎÙÊ ÆÁÊÌÏ×ÙÊ ÄÅÓËÒÉÐÔÏÒ fd.
EINVAL
äÅÓËÒÉÐÔÏÒ fd ÓÓÙÌÁÅÔÓÑ ÎÁ ÓÏËÅÔ, Á ÎÅ ÎÁ ÆÁÊÌ.
EINVAL
äÅÓËÒÉÐÔÏÒ fd ÎÅ ÏÔËÒÙÔ ÄÌÑ ÚÁÐÉÓÉ.

óïïô÷åôóô÷éå óôáîäáòôáí

4.4BSD, SVr4 (ÜÔÉ ÓÉÓÔÅÍÎÙÅ ×ÙÚÏ×Ù ×ÐÅÒ×ÙÅ ÐÏÑ×ÉÌÉÓØ × BSD 4.2). SVr4 ÄÏËÕÍÅÎÔÉÒÕÅÔ ÄÏÐÏÌÎÉÔÅÌØÎÙÅ ËÏÄÙ ÏÛÉÂÏË truncate: EINTR, EMFILE, EMULTIHP, ENAMETOOLONG, ENFILE, ENOLINK, ENOTDIR. SVr4 ÄÏËÕÍÅÎÔÉÒÕÅÔ ÄÏÐÏÌÎÉÔÅÌØÎÙÅ ËÏÄÙ ÏÛÉÂÏË ftruncate EAGAIN É EINTR. POSIX ÓÏÄÅÒÖÉÔ ftruncate, ÎÏ ÎÅ truncate. óÔÁÎÄÁÒÔ POSIX ÎÅ ÏÐÒÅÄÅÌÑÅÔ, ÞÔÏ ÐÒÏÉÚÏÊÄÅÔ, ÅÓÌÉ × ÆÁÊÌÅ ÍÅÎØÛÅ ÂÁÊÔ, ÞÅÍ length.

ïûéâëé ÷ òåáìéúáãéé

üÔÉ ÓÉÓÔÅÍÎÙÅ ×ÙÚÏ×Ù ÄÏÌÖÎÙ ÂÙÔØ ÏÂÏÂÝÅÎÙ, ÞÔÏÂÙ ÒÁÚÒÅÛÉÔØ ÏÔÂÒÁÓÙ×ÁÎÉÅ ÃÅÌÙÈ ÕÞÁÓÔËÏ× ÆÁÊÌÁ.

óíïôòé ôáëöå

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