Download The GNU C library reference manual by Sandra Loosemore, Richard M. Stallman PDF

By Sandra Loosemore, Richard M. Stallman

For GLibc model 2.2.x
This quantity guide is the great consultant to the GNU implementation of the normal C libraries. It covers either low and high point interfaces, together with functionality necessities, code examples, and utilization options. this article comprises goods of curiosity to either the approach administrator and the programmer.

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Extra info for The GNU C library reference manual

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This can be convenient, but beware that older implementations (before ISO C) may not support this behavior, and will probably crash when realloc is passed a null pointer. Like malloc, realloc may return a null pointer if no memory space is available to make the block bigger. When this happens, the original block is untouched; it has not been modified or relocated. In most cases it makes no difference what happens to the original block when realloc fails, because the application program cannot continue when it is out of memory, and the only thing to do is to give a fatal error message.

1 [Program Arguments], page 665. char * program invocation short name Variable This variable’s value is the name that was used to invoke the program running in the current process, with directory names removed. ) The library initialization code sets up both of these variables before calling main. Portability Note: These two variables are GNU extensions. If you want your program to work with non-GNU libraries, you must save the value of argv[0] in main, and then strip off the directory names yourself.

H> int main (int argc, char *argv[]) { #ifdef DEBUGGING mtrace (); #endif ... } This is all what is needed if you want to trace the calls during the whole runtime of the program. Alternatively you can stop the tracing at any time with a call to muntrace. It is even possible to restart the tracing again with a new call to mtrace. But this can cause unreliable results since there may be calls of the functions which are not called. Please note that not only the application uses the traced functions, also libraries (including the C library itself) use these functions.

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